文档介绍：Enhanced Photocatalytic Degradation of Humic Acid
2+
in Fe2O3 Aqueous Suspension by increasing Ca
strength Under a Blue Light Irradiation

Guangyue Ding, Caixia Li, Caimei Fan※, Yanping Sun
College of Chemistry and Chemical Engineering
Taiyuan University of Technology
Taiyuan, China
fancm@

Abstract—This study aimed at improving the photocatalytic applications in the fields such as solar energy conversion and
oxidation of humic acids (HA) in α-Fe2O3 suspensions by adding catalysis [14]. However, in our study about the photocatalytic
2+
calcium cationic ion (Ca ). A visible light photocatalyst of α- degradation of HA in α-Fe2O3 suspensions under blue light
Fe2O3 was prepared by co-precipitation method and irradiation, we found that the degradation of HA was high
characterized by X-ray diffraction (XRD) and scanning electron dependency on solution pH, especially in the acidic conditions,
microscope(SEM). First a set of tests was conducted in the HA was better degraded, and in the neutrality conditions HA
dark to study the adsorption of HA onto α-Fe2O3 in suspensions was not degraded. However, When calcium ion exists in the
at different calcium concentrations. Then the photocatalytic solution, the photocatalytic degradation rate of HA was
degradation of HA under blue light irradiation was investigated considerable, this phenomenon